Lubricant pump



Dec. 4 1923.

C. H. 'SCOTT LUBRICANT PUMP Original Filed March 26,

Patented Dec. 4, 1923.

UNITED STATES CHARLES H. SCOTT, F SOUTH PASADENA, CALIFORNIA.

LUBRICANT PUMP.

Application med March 2e, lazo, seriai No. 358,921.

To aZZ whom t may concern:

Be it known that I, CHARLES H. SCOTT, a citizen of the United States,residing at South Pasadena, in the county of Los Angeles and State ofCalifornia, have invented a new and useful Lubricant Pump, of which thefollowing is a specification.

This invention relates to a lubricant pump, and especially to a greasepump or grease gun, and the main object of the invention is tofacilitate the filling of the pump with grease, or lubricant.

A further object of the invention is to enable the grease pump to befilled with a lubricant without trapping air in the pump. Grease pumpsat present in use are filled by removing the head of the pump, togetherwith the plunger, and forcing grease into the body of the pump with asuitable implement. 1n this operation it is diflicult, if notimpossible, to avoid trapping of more or less air in the lower part ofthe pump body back of the grease, the air so entrapped in the pumpbarrel `interfering with the pump and with effective operation of thelunger in ejecting the grease after filling.

Iy invention provides for escape of the air from the pump barrel so asto avoid such trapping of air in the barrel.

Another object of the invention-is to facilitate the iilling of the pumpbarrel by so constructing the parts that the barrel can be used as ascoop by the barrel being forced into the body of grease until it islled with lubricant and then withdrawn in filled condition. 1n thisconnection, my invention provides for normally protecting or sheathingthe pump barrel externally for con# venience and cleanliness in handlingand for exclusion of dirt and grit from the body of lubricant. i

The accompanying drawings illustrate an .embodiment of my invention, andreferring thereto:

F ig. 1 is a partly sectional side elevation of the pump;

Fig. 2 is a section on line 2-2 in Fig. 1;

Fig. 3 is a detailed section of a spring washer device for retaining theparts in position;

Figs. 1 to 6 are detailed sections of modilications, partly inelevation.

The pump constitutingv my invention comprises a barrel or cylinder 1open at one end and closed at the other end, indicated at 2, except fora screw thread central opening Renewed May 19, 1923.

3 through which works a screw threaded plunger rod 4 carrying at one endan operating handle 5 and at the other end a piston or plunger 6. Barrelor cylinder 1 is provided near its inner end with one or more openings 7serving as air vents, said open? ings being spaced sufficiently from thehead 2 to enable the plunger 6 to move beyond these openings, asindicated in dotted lines, so as to expose the openings at the interiorof the barrel. The barrel or cylinder 1 is preferably formed with abevelled edge 8 at, its inner end to facilitate entrance of the barrelin the body of lubricant.

Means are provided for closing the outer end of the barrel rapidly andconveniently without requiring more than a small part of a single turnof the closure part as distinguished from the several turns requiredwith the ordinary screw threaded head, said means comprising a cylinderhead 10 provided with an outlet` pipe or duct 11 for the grease and witha tapering or converging conical wall portion 12 having a plurality ofbayonet joint notches or slots y 13 in its end portion adapted toengagey pins or lugs 14 secured on the barrel or cylinder 1. A washer 15of leather, or other suitable material, is arranged within the head 10and is pressed by a spring 15 so as to engage the outer end of thecylinder or barrel 1 and thereby prevent the detachable cylinder head 10from being accidentally displaced. Packing means is provided between thewall 12 of said cylinder head and the cylinder or barrel 1, said packingmeans consisting of a ring 16 of suitable yielding material, such asleather, felt, or the like, held against a shoulder 17 in wall 12 bycoil spring 18, said packing ring being cylindrical on its inner face,and conical, or convergent on its outer face, so as to fit therespective members 1 and 12 and provide a'tight joint. At its inner endthis packing ring is preferably concavey so as to enable the pressure ofthe iiuid or semifluid lubricant to expand the rearwardly eX- tendingparts at either side of this concavity into tight contact with the wallportions. rThis construction, together with the taper or wedge shape ofthe packing ring, causes the packing ring to automatically seal thejoint and to check any tendency of the lubricant to eXude past thepacking ring, the sealing or closing action increasing as the pressureincreases. The outlet pipe 11 is or any suitable length and may beprovided, it desired, with the usual flexible portion for convenience indelivering the grease to the desired point. A cylindrical sheath 2O ismounted or formed on the detachable head 10, :tor example, by screwingon the rim portion oi said head, and is adapted to surround and enclosethe body ot the barrel or cylinder 1, said cylindrical sheath iittingwithin a cap 23 which is mounted on the head 2, tor example, by means ofa fastening nut 2l, and is adapted to lit over the free end of thecylindrical sheath 2O so as to make a tight joint. This cap 23 ispreferably provided with a beaded or rounded rim 27 to 'facilitateentrance of the cylindrical shea-th 2O within the cap.

The device is used as follows:

To till the device the head member l is removed from the barrel 1 byturning the head member slightly so as to release pins let from thebayonet slots 13 and the said head 10, together with the sheath 20attached thereto, is then withdrawn bodily from the barrel or cylinder 1leaving said barrel or cylinder 1 open at its upper end. The plungerscrew elis operated `by handle 5 so as to draw the piston t3 inwardlypast the opening 7 so as to expose said opening and thereby provide avent for air. The barrel or cylinder 1 is then plunged or pushed intothe body of grease or lubricant in the manner ot a scoop and thelubricant in thereby forced into the cavity within said barrel orcylinder 1 to completely lill the same, the air above the greaseescaping through the vent opening 7 so thatl trapping of air above thegrease is avoided. The head 10 is then replaced on the barrel orcylinder V1, the cylindrical sheath then surrounding said barrel orcylinder so that the surface of the latter, which is necessarily coatedwith grease or lubricant from the scooping action, is protected fromcontact with external objects, serving the double purpose o'l:facilitating handling ot the device without soiling the hands and alsokeeping the external surtace of the barA rel free from grit or othermaterial which would seriously injure the eli'ectiveness et thelubricant ou adu'iixture therewith when the barrel is inserted into thebody of lubricant. To eject the grease or lubricant the piston 6 isoperated by means of the hand wheel, or handle 5 in obvious manner tocause the grease to be pressed out through the outlet 11 in the head l0.In this operation the self-sealing packing prevents exe udation of thegrease at the oint between the .members 10` and 1.

I prefer to provide a cock or valve 28 in the outlet pipe 11 so as toprevent exudation of the grease when same is not desired. There is atendency in grease pumps for the grease to continue to flow out for alimited time after operation or" the plunger but by closing the valve 28this can be prevented.

Other constructions or the quickly detachable joint between the easing 1and the head may be provided, thus, as shown in Fig. L1, the casing 1may be provided with an external ring 33 having an inclined or bevelled`face 33 oppositely inclined to the wall 12 of the head 10 and thepacking washer 1G in this case is provided with inclined faces on boththe inside and outside thereof, giving a more eitective packing actionand facilitating the entrance of the casing into the head. The packingretaining spring 18 may, in this case, be made suiiiciently strong tohold the parts in position without requiring the spring operatedretainer, such as shown at 15 in Fig. 1.

As indicated in Fig. 5, I may use instead of a bayonet joint for thecoupling of the casing to the head a flange at the outer end or rim ofthe wall 12 of the head 10, and provided with notches, one of which isindicated at 30', through which the coupling pin passes, said couplingpin engaging with the bottom ot this notch.

As shown in Fig. 6, the construction may be modiiied by omitting` thespring pressed packing and using instead a packing ring 34 of leather,or simi ar material, resting on the lower head 10 for the casing 1 andengaged by the lower end of the casing 1 to make a tight joint, thebayonet joint slot 35 being in this case preferably inclined, as shown,to give a wedging action so as to ensure atight joint.

In connection with my improved lubricant pump, I prefer to use anindicating device giving visual indication of the amount of lubricantdelivered from the pump at any operation. For this purpose a scale barmay be provided extending through slots l1 and 42 in the upper end 2 ofthe casing 1 and in the cap 23, as shown in Fig. 1, and connected to thescrew plunger d by a swivel connection 43, so as to cause the scale barto be moved longitudinally through the head 2 and cap 23 in theoperation ot the plunger rod and piston; this .se-.ile .har 10 beingprovided with scale marks or gradfuations del, which may be read withrespect to any fixed indicating mark, for example, the top of cap 23 toindicate the advance of the piston 6 in forcing out 'the lubricant andthereby indicate the amount of lubricant delivered.

lhat I claim is:

1. A lubricant pump comprising a barrel closed at one end and having apiston working therein and provided with operating means extendingthrough the closed end of the barrel, said barrel having one end open toenable the barrel to be used as a yscoop for filling the same, a sheathmounted on and extending around the barrel, a head detachably mounted onthe barrel to close the same, having a wall portion extending around theopen end of the barrel, and a packing ring lextending between said wallportion of the head and said barrel, said packing ring being adapted forcompression against said wall portion and said barrel, by

the pressure of the lubricant.

2. A lubricant pump comprising a barrel having a closed head at one end,and having its other end open to enable the barrel to be used as a scoopfor lling the same a piston working in'said barrel and having operatingmeans extending through the closed end of the barrel, a head detachablymount- 15 ed on the open end of the barrel to close the same, andprovided with an outlet and with a wall portion surrounding said barrel,a cylindrical sheath Carried by said head and extending around saidbarrel to protect the saine, and a tapering packing ring extendingbetween the wall portion of said head and said barrel, and exposed atits larger end to pressure of the lubricant Within said head to causethe joint between said parts to be reached by the pressure or" thelubricant.

In testimonT whereoirI I have hereunto sub'- seribed my name this 17thday of March, 1920.

CHARLES H. SCOTT.

